The strengthening of all organs, especially those weakened, through a muscle system activation tailored precisely to each specific case, is the proven fundamental principle of therapeutic gymnastics. Friedrich Robert Nitzsche explains the means and goals, as well as the possibilities and limitations of therapeutic gymnastics. Through numerous exercises, he illustrates what everyone can do for a healthier and stronger body. Nitzsche follows a holistic approach in this regard. The chest area, which includes the heart and lungs, represents the core of the body in his explanations, from which the strengthening of all other organs and body parts can also be achieved. This is a carefully processed reprint of the original edition from 1880.